You need to write 3 consecutive EVEN numbers using only one variable. multiply by 2 to ensure the numbers are even. Add or subtract 2 to get the next consecutive number. (2x - 2) , (2x) , (2x + 2)
add them up to equal -78 -78 = (2x-2) + 2x + (2x+2) -78 = 6x -78/6 = x -13 = x